This crate exposes a single type: FileDesc,
which acts as a thin wrapper around open file descriptors.
The wrapped file descriptor is closed when the wrapper is dropped,
unless FileDesc::into_raw_fd() was called.
A raw file descriptor can be wrapped directly using FileDesc::from_raw_fd(),
or it can be duplicated and then wrapped using FileDesc::duplicate_raw_fd().
It is also possible to duplicate an already-wrapper file descriptor using FileDesc::duplicate().
If the platform supports it, all duplicated file descriptors are created with the close-on-exec flag set atomically,
```rust use filedesc::FileDesc; let fd = unsafe { FileDesc::fromrawfd(rawfd) }; let duplicated = fd.duplicate()?; asserteq!(duplicated.getcloseon_exec()?, true);
duplicated.setcloseonexec(false)?; asserteq!(duplicated.getcloseon_exec()?, false); ```